Scale lever



Feb. 3, 1931. v H. o. HEM 1,790,862

SCALE LEVER Filed-Feb. 25, 1920 2 Sheets-Sheet. l

' Feb. 3, 1931. H. o. HEM 1,790,862

SCALE LEVER Filed Feb. 25, 1920 2 Sheets-Sheet 2 aummtoz HALVUR U. HEM.

in di%cult to perform, especially if the lever ure 8;

Patented Feb. 3, 1931 v I 3 i I UNITED STATES PATENT OFFICE] HALVOB o. HEM, or roLEno, orno, ASSlGNQIR. 'ro mams lm mnem me 'comrm, or TOLEDO, onro, A conronnrrou or unw anzasnr scALE LEVER Application filed February 25, 1920; Serial No. 361,252.

This invention relates to means for mount- Figure 2 is an end elevation of the same ing knife edge pivots, and particularly means Figure 3 is a perspective view of the knife fOr securing such pivots to scale levers. As edge pivot employed; t w

I such levers are now constructed, the knife Figure id is a section taken substantially I 5 edge pivots are usually placed the mold on the line 44'of Figure 1; i

in which the lever is to be cast and are thus Figure 5 is a perspective view of the pivot fixed in place when the metal of the lever retainer formingan element of my invention; solidifies. In order that the scale may Weigh Figure 6 is a section of-a lever equipped properly the pivots in the scale levers must be with another embodiment I of, my invention,

placed with great exactness, and the practice the section beingtakenron the line. 6I6 of of casting the levers with the pivots in place Figure 7 1 v I results in the loss of many castings, owing Figure 7 is a side elevation of a fragment to the pivots having been improperly placed of a lever equipped with the pivot and retain- I or having shifted in the mold. Further er shown in Figure 6; II

15 more, the pivots warp and lose their temper Figure 8 is a fra entaryside elevation during the casting process and must be re-' showing another em odiment of my inven-' shaped and re-ha'rdened, which, When the tion; r I pivots are fixed in the lever, involves grind- Figure 9 is a similarview showin aislight I and heat treating operations that are modification of the form illustrate I inFigbe a heavy one. Where the pivot is thus fixed Figure 10 is a sectional view takensu'bstanin place it must be a bar of sufiicient cross tially on the line l010 of Figure 9;

section to support the weight, and as'these Figures 11 and 12 are respectively a frag- I bars are of high gradesteel their cost is conmentary elevation and vertical section show- I siderable. The practice of inserting the piving a further modification, the section of F ig- 7 ots in holes drilled or machined in the lever ure 12 being taken substantially as indicated is also followed to some extent. The insert on the line 12- 12 of Figure 11. g I ed pivots must in this case,'however, be'even Referring to the drawings in detail, and

heavier than those fixed in place by casting, particularly toFigures l-to '5,'the lever 1 is and the expense due to the use of inserted provided with'a tapered bore for each pivot 80,

pivots is therefore very great. and a groove is machined in the wall of each .-The principal obj eot of this invention is to bore. The pivot retainer 2 shown in Figure provide improved means whereby pivots con- 5 is formed-With a tapered central portion I taining' a minimum amount of expensive 3 adapted to fit one of the tapered bores I V 5 metal may be securely and accurately fixed in thelever 1,0ne of the ends 4 of the pivot 9 replaceable.

to' a scale lever. I retainer being small enough to pass through Another object is the provision of means the bOl'EL' 'One side of the pivot retaineris whereby the pivots may be securely fixed to gr0oved,as at 5, to receive the pivot 6. 'The alever so as to be readily" detachable and pivot 6 (shown'in Figure 3)is of hardened I steel and the pivot retainer maybe of-less Other objects andadvantages will be apexpensive material. j In orderfto securely parent from the followingidescription, in clamp thepivot in pl'acethe pivot retainer which reference is bad to the accompanyis'split from the bottom of the grooveto ing drawings illustrating preferred embodi-t beyond its longitudinal center by a kerf 7 7 f ments of my invention and whereinsimilar and provided with ibolt holes 8 and 9 tofrereference numerals designate similar parts ceive clamping bolts .10 and 11. I II throughout the severalview's. In assembling the structure'the pivot 6 is I In the drawings I placed in the groove 5' and theretainer is Figure l is a side elevation of a lever then inserted in the tapered bore in the Y equipped with my invention; leverL vThe bolts 10 and ll are passed 3- For the purpose of providing a thrust bearing for the bearing block (not shown), which the knife edge of the pivot 6 is'adapted to engage, notche'dplates 12 of hardened steel are screwed or otherwise secured to the sides of the lever adjacent the pivots 6.

In Figures 6 and 7 I have shown a second embodiment of my invention. In this embodiment the pivot retainer 2, .has an intermediate tapered portion adapted to fit into a tapered bore in the lever 1. Instead of being grooved throughout its length, the pivot retainer is provided with a pair of aligned grooves 5 extending inwardly from each end. Extending obliquely through the retainer and cutting into the corners of the grooves 5 are holes adapted to receive notched clamping bolts 10 and 11.

In assembling this form of the device, the retainer 2 is driven into place and the bolts 10 and 11 are placed in the bolt holes with the notches in the bolts registering with the corners of the grooves 5 Pivot sections 6" are then seated in the grooves and the bolts 1O are tightened up, thus securely clamping the pivot sections in place against the opposite walls of the grooves 5. 'In this embodiment thrust bearings for the bearing block which the knife edges are adapted to engage are formed by inserting pins or blocks of hardened steel in depressions in the lever 1 The blocks 12 may be driven into the lever or threaded and screwed into it or they may be merely snugly inserted and held in place by the pivot sections 6?, as shown in Figures 6 and 7.

In the embodiment shown in Figure 8 the pivot retainer '2 is substantially like that shown in Figure 5. The knife edge pivot is in two sections 6", like those shown in Figure 6, and the thrust bearing consists of a hardened bar rectangular in cross section, which lies in a groove milled in the wall of the bore through the lever 1 In the embodiment shown in Figures 9 and 10 the pivot retainer 2 is substantially like the retainer 2 shown in Figure 1. The pivot is in two sections 6. A spline 12, of substantially the same widthas the pivot sections 6, is inserted in the groove 5, and

Y when the pivot retainer is inserted into the tapered bore in the lever 1 the spline 12 lies in a groove which is milled in the wall of the tapered bore. The pivot sections are seated in the ends of the groove 5,-the bolts 10 and 11 tightened up, and the pivot retainer driven home. 7

1n the embodiment shown in Figures 11 '2 and the lever 1 is identical with that shown in Figures 9 and 10. The pivot 6 is like that shown in Figures 1 to 1; the thrust bearing is formed by inserting a grooved bar 12 in the groove through the lever 1 and the groove in the bar 12 is shaped so as to fit over the centralpart of the knife edge pivot.

From the above description it is apparent that while the pivots 6 sustain the wear, the shearing and bending strains are sustained by the pivot retainers. The pivots may therefore be made of amplestrength with the use of very little expensive metal. It is also apparent that the pivots may be removed for re-sharpening or replacement without removing the scale .levers.

lVhile it will be apparent that the illustrated embodiments of my invention herein disclosed are Well calculated to adequately fulfill the objects primarily stated, it is to be-understood that the invention is .suscepti ble to variation, modification and change within the spirit and scope of the .subjoined claims.

Having described my invention, I claim:

1. In a device of the class described, in combination, a lever having a bore therein, aplvot retainer inserted in said bore, said pivot retainer having a groove along one side thereof and a kerf along the bottom of said groove, and a knife edge pivot seated in said groove.

2. In a device of the class described, in

combination, a lever havin therethrough, a grooved pivot retainer inserted in said bore, a spline in the groove of said bore and said pivot retainer, and apivot seated in the groove of said pivot retainer. 3. a device of the class described, in combination, a lever having a bore therethrough, a grooved pivot retainer inserted insaid bore, there being a kerf in said pivot retainer opening into the groove thereof, a knife edge pivot seated in the groove of said pivot retainer, and clamping means extend mg transversely of said kerf.

4. In a device of the class described, in com blnation, a lever having a grooved bore therethrough, a grooved pivot retainer inserted in said bore, there being a kerf in said retainer opening into the groove thereof, a spllne 1n the groove of said bore and said pivot retainer, a knife edge pivot seated in a grooved bore the groove of said pivot retainer, and clamping means extending transversely of said kerf. V I

'5. In a device of the class described, in combination, a lever having a bore therethrough and a recess above the said bore, a pivot retainer in said bore, pivots mounted on saidpivot retainer, and thrust bearing means mounted in said recess.

HALVOR O. HEM. 

